Siemens 3RT1044-3B Power Contactor

The Siemens 3RT1044-3BB40 power contactor is a three-pole AC-3 rated device designed to start and stop three-phase motors in industrial controls. It is capable of switching up to 65 A and up to 30 kW at 400 V, with a 24 V DC control coil for reliable energization in standard control circuits, and it uses a spring-type main terminal for secure, vibration-resistant connections in panel installations. This Size S3 contactor is intended for AC-3 duty, which covers the switching and starting of moderate to heavy three-phase loads in automation systems, making it suitable for general motor control in manufacturing environments where a 400 V supply is present. The catalog notes the 3RT1044 family is part of Siemens Sirius lineage, with a stated successor in the 3RT2 family to ease migration while preserving mounting and electrical interfaces.